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The last Unidata applications training workshop for GEMPAK was conducted October 25-27, 2006. Attendees of the GEMPAK workshop traveled from Korea, Mali, Burkina Faso, Brazil, and Canada in addition to domestic institutions.
NCEP developers have provided notification for retirement of five legacy GEMPAK GD programs. They are: GDCNTR, GDSTREAM, GDWIND, GDMAP and GDPLOT. The functionality of each of these programs is fully incorporated into GDPLOT2. In addition, GDPLOT2 provides additional capabilities beyond the capabilities provided by these individual programs. Minimal changes are needed to go from the legacy program parameter settings to GDPLOT2 parameter settings. The last release to support these programs will be 5.11.2 (February, 2008).
Additions to 5.10.2 include:
Dr. Chuck Graves hosted a GEMPAK and IDV site visit to SLU March 19-21, 2007. The visit provided direct interaction with undergraduate and graduate classes, one-on-one time with individual students as well as site administrator, a departmental presentation on Unidata activities, and a presentation at the student AMS meeting.
The maximum grid size supported by N-AWIPS grid programs has been increased from 750,000 to 1,000,000 points. In addition, the grid size limit has been completely eliminated in the following programs: NAGRIB, NAGRIB2, GDGRIB and GDGRIB2. The programs NAGRIB and GDGRIB were converted from FORTRAN to C to eliminate the restriction. In addition, in preparation for completely eliminating the grid size restriction, the programs GDDIAG and GDLIST were converted to C. Larger grids may be subsampled in area or grid stride for use in GEMPAK.
Other additions include:
NCEP is developing XML/XSLT infrastructure within GEMPAK as part of the creation of products by NMAP2. Future development will include a migration of the current table structure from column based formats to XML, which will remove legacy issues regarding metadata and precision, as well as increase the utility of these tables with other packages.
GEMPAK 5.9.4 introduces a rewrite of the core GEMPAK grid diagnostics library routines in C. This initial phase is a straight translation of routines from Fortran to C, which will be followed by implementation of dynamic memory allocation, thereby facilitating the use of GEMPAK with increasingly large data sets.
An overarching goal in the GEMPAK library rewrite is to separate the library routines from the underlying data files and formats. This will facilitate the use of GEMPAK routines in the next generation AWIPS development. A primary benefit of this work will be the ability to support a wider range of data sets, including remote access.
Iowa State is actively using GEMPAK radar mosaics with their mesonet products in GIS applications. To facilitate this process, I developed the GEMPAK program NEX2IMG to generate composite images which can be used with a file to provide GIS navigation information. Daryl Herzmann has put together a How-To document to help other sites set up their own radar mapservers.
All the documentation for the GEMPAK workshop is made available through the GEMPAK tutorial. Included in the presentation are numerous sample exercises and output samples. This format of presentation allows workshop participants to be able to review or utilize any of the material at their home institution. The tutorial is updated as new features dictate.